III.J.K1 Flashcards
- During full power output of an unsupercharged engine equipped with a float type carburetor, in which of the following areas will the highest pressure exist?
Carburetor air scoop.
- As manifold pressure increases in a reciprocating engine, the?
Density of air in the cylinder increases.
- Which of the following statements regarding volumetric efficiency of an engine is true?
It is possible to exceed 100% volumetric efficiency of some engines by the use of superchargers of the proper type.
- Which of the following would be a factor in the failure of an engine to develop full power at takeoff?
Improper adjustment of carburetor heat valve control linkage.
- Boost manifold pressure is generally considered to be any manifold pressure above?
30 inches of Hg.
- The purpose of a bellmouth compressor inlet is to?
Maximize the aerodynamic efficiency of the inlet.
- What methods are used to provide clean air to the engines of helicopters and turboprop airplanes that have particle separators installed?
Sharp airflow directional change to take advantage of inertia and centrifugal force, and filters or engine inlet screens.
- If a fire starts in the induction system during the engine starting procedure, what should the operator do?
Continue cranking the engine.
- On small aircraft engines, fuel vaporizaton may be increased by?
Circulating the fuel and air mixture through passages in the oil sump.
- Which of the following defects would likely cause a hot spot on a reciprocating engine cylinder?
Too much cooling fin area broken off.
- What part of an air cooled cylinder assembly has the greatest fin area per square inch?
Exhaust valve port.
- Reciprocating engines used in helicopters are cooled by?
A fan mounted on the engine.
- The greatest portion of hest generated by combustion in a typical aircraft reciprocating engine is?
Carried out with the exhaust gases.
- A broken cooling fin on a cylinder head?
May be filed to smooth contours if damage or repair limits are not exceeded.
- An engine becomes overheated due to excessive taxiing or improper ground run up. Prior to shutdown, operation must continue until cylinders have cooled, by running engine at?
Idle RPM.
- Cylinder head temps are measured by means of an indicator and a?
Thermocouple sensing device.
- High cylinder head temps are likely to result from?
A very lean mixture at high power settings.
- Prolonged idling of an engine will usually result in?
Foreign material buildup on spark plugs.
- The most common method and generally the best conduction of heat from the inside of a cylinder barrel to the cooling air is accomplished by?
Machining fins directly on the outside of the barrel.
- What is the function of a blast tube as found on aircraft engines?
A device to cool an engine accessory.
- Which of the following results in a decrease in volumetric efficiency?
Part throttle operation.
- The undersides of pistons are frequently finned. The principal reason is to?
Provide for greater heat transfer to the engine oil.
- Increased engine heat will cause volumetric efficiency to?
Decrease.
